If you can, keep the F18 and continue sailing with your wife. If this is something you used to do together, dont let go of it!
If you are unable to go sailing together, but you can get a kitchen pass, go A-cat or F16. If wife also likes to sail, and will have ago while you look after your kid, go A-cat as that is the lightest one to handle on the beach.
Primarily, I would look after someone to take care of the child while I went sailing with the wife.
Congratulations with the family! Take care of your kid, your wife and yourself